单项选择题

A deadly disease has affected these animals.

A. contagious
B. serious
C. fatal
D. worrying
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单项选择题
When doves are about two weeks old, they are covered with grey feathers and are ready to try their wings.
A. grow
B. wrap
C. hide
D. test
单项选择题
The dentist has decided to extract her had tooth.
A. take out
B. repair
C. pull
D. dig
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